Shaft-coupling.



T. C. DAWSON. SHAFT COUPLING.

IIIIIIIIIIIIIIIII 1111.23, 1911. 1,006,362. Patented 0 31 121911.

UNITED I sTAtpns PATEET oFFIoE. T

THOMAS 0. DAWSON, 0F SMITHS FERRY, PENNSYLVANIA.

Specification of letters Patent.

SHAFT-COUPLING.

, Application filed March 28, 1911. Serial No. 616,462.

To all whom it may concern:

Be it known that I, THOMAS C. DAWSON, residing at Smiths Ferry, in thecounty of Beaver and-State of Pennsylvania, a citizen of theUnited-States, have invented or dis-.

covered certain new and useful Improvements in Shaft-Couplers, of whichimprovements the following is a specification.

In pumping oil. from wells, the usual practice is to connect asucker-rod, consistmg of a series of relatively short rods (joined endtoend), to a walking beam or jack. In order to join the rods together,where steel sucker-rods are employed, the ends of each section areusually equipped by the manufacturer with what are termed a box and a 9in, which are suitable metal sleeves rigidly secured to the rods;

and because the standard lengths of the rod sections seldom prove to bethe exact length required to make connection to whatever pumpingmachinery is used, such connection is usuall made through anintermediate length 0 wood sucker-rod.

M invention relates to a coupler, particular y applicable, although notlimited, to

the direct connection of a steel suckenrod' to a walking-beam, and theobject ofmy inventionis to provide a practical and efficient coupler. I

In the accompanying drawing, which forms part of my specification,Figure 1 is an elevation of my improved coupler'engaging a rod, and Fig.2 is a vertical sectional view taken on the line IIII, Fig. 1.

Like numerals are used to designate like parts.

As shown, the coupler preferably consists of a sleeve 1, suitablyprovided with a means of attachment, such as screw-threads, to theconnecting piece 2. The upper end of the said sleeve 1 is suitablyprovided with a shoulder 3 to receive the upset end of a sucker-rod 4,and, to the end that the said upset rod will have no loose play, asuitable packing 5 may be inserted in the cup-shaped portion of theconnecting piece 2. To secure the said connecting piece to a walkingbeam I preferably form a threaded extension 6 on said piece, and anangular portion 7 may also be formed on said piece to form Patented Oct.17, 1911.

a means for engagement for a tightening wrench or elevators.

2 will preferably be of the same diameter as the screw-threaded portionof .the pin And in this construc- 1 tion the extension 6 of theconnecting piece usually secured to each sucker-rod section,

to the end that the connection of the sucker-- rod to the polished rodof the walking-beam may be the same regardless of whether the lastsection of rod has or has not been cut.

In making an attachment'with my conpler the excessive length of thesteel suckerrod is cut off and the sleeve 1 is sli ped over theextending portion, the end 0 which is then suitably upset. The saidsleeve may then be raised lnto a position wherein the upset end of therodis seated upon the shoulder 3 and the'connecting-piece may then bescrewed upon the sleeve. g

It will be observed of my invention that I have provided a couplerwhereb asuckerrod may be easily connected to t e polished rod of awalking-beam and wherein the full strength of the sucker-rod may bedeveloped.

It will be observed that by providing the.

recessed shoulder or seat adpacent to the screw-threaded end of thesleeve, two advantages may be obtained. In the first place the end ofthe sucker-rod to be upsetis open to the free manipulation of whateverupsetting tool may be used; and in the second place when there is a pullupon the rod, its flared upset end will act as a wedge to spring t closeand unyielding engagement with the' ine externallythreaded sleeve intoternally-threaded cup of the second member.

take over the head upset on such rod, and a gagement clamping saidmember to the sleeve, said sleeve adapted to surround such aforesaidmember. 10 rod and screw-threaded externally to en- In testimony whereofI have hereunto set gage said internally-threaded cup, said my hand. 4

5 sIeeve further provided with a shoulder at THOMAS C. DAWSON.

one ehd engaging the upset head of the rod Witnesses: from beneath whenapplied thereto and PAUL N. CRI'roHInw,

through its aforesaid screw-threaded en- ALICE A. TRILL.

